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How do positive and negative astigmatism differ?

Why are there two different methods (positive and negative) for recording astigmatism? [more inside]
posted by dmd on Jan 6, 2012 - 3 answers

 

Dots wobble, but they don't fall down.

How would you quantify wobble? [more inside]
posted by dmd on Aug 4, 2010 - 16 answers

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